Crypto for EUDI wallet
Updated the 18th of March 2026.
This is a web application that allows users to prove ownership of a crypto wallet and receive a verifiable attestation (EAA) representing that ownership in their EUDI wallet.
The application enables the issuance of a Proof of Crypto Ownership credential bound to a crypto wallet address, using the OpenID for Verifiable Credential Issuance (OIDC4VCI) standard.
Overview
This application is part of a broader architecture enabling secure and compliant crypto-asset payments in Europe using the EUDI Wallet.
In this context, the application acts as a credential issuer responsible for delivering a Proof of Crypto Account Ownership credential, also referred to as SCA (Strong Customer Authentication).
Context
In EUDI-based payment flows, identity, authentication, and transaction execution are separated:
- The EUDI Wallet provides identity, authentication, and user consent
- The crypto wallet executes the blockchain transaction (self-custodial)
- The blockchain acts as the settlement layer
- A payment gateway orchestrates the interaction
To securely authorize a payment, the user must prove that they control the blockchain account used for the transaction.
This proof is provided through a verifiable credential issued by this application.
Role of this application
This application enables the issuance of a Proof of Crypto Account Ownership credential that:
- Cryptographically links a user to a blockchain address
- Is issued as a (Qualified) Electronic Attestation of Attributes (Q)EAA
- Can be presented by the user through their EUDI Wallet
- Is used as part of Strong Customer Authentication (SCA) in payment flows
How it is used
Once issued, this credential can be used in EUDI-based payment flows to:
- Prove control of the blockchain account used for payment
- Enable Strong Customer Authentication (SCA) aligned with ARF TS12
- Bind user consent to a specific transaction
- Support identity-based crypto-asset payments
This enables a model where:
- The user keeps full control of their funds (self-custodial wallet)
- Identity and consent are handled by the EUDI Wallet
- Payments are executed directly on the blockchain
- No intermediary controls user assets
Position in the overall architecture
This application corresponds to the credential issuance layer in the broader system:
What it does
It provides the following functionality:
- Connects to a user's crypto wallet using WalletConnect or Beacon (Tezos)
- Requests the user to sign a message to prove control of their wallet address
- Verifies the signature server-side
- Issues a verifiable credential attesting wallet ownership
- Delivers the credential to the user's EUDI wallet via QR code
- Notifies the web application when credential issuance is complete
The issued attestation can then be used as a trusted proof that the user controls a specific crypto address.
Key capabilities
- Proof of crypto wallet ownership without transactions
- Issuance of EAA in SD-JWT VC forrmat
- OIDC4VCI compliant credential issuer
- Integration with Tezos wallets via Beacon
- Delivery of attestations to EUDI wallets
Supported wallets
Tezos Mobile Crypto Wallet
Any Tezos mobile wallet compatible with Beacon, including:
EVM Mobile Crypto Wallet
Any EVM mobile wallet compatible with WalletConnect, including:
EUDI Wallet compliant wallet with OIDC4VCI draft 15 to Final 1.0
- 🇫🇷 Altme Wallet
- 🇸🇪 Igrant.io Wallet
- 🇩🇪 Lissi Wallet
- 🇫🇷 Talao Wallet
- 🇪🇸 VID Wallet
Supported credentials
The issuer can deliver credentials such as SD-JWT VC:
- Crypto Account Proof (crypto wallet ownership)
Standards used
- OpenID for Verifiable Credential Issuance (OIDC4VCI) 1.0
- SD-JWT Verifiable Credentials
- WalletConnect
- Beacon SDK (Tezos wallet connection)
Purpose
It enables trusted linking between a decentralized identity wallet and a crypto wallet address, allowing verifiable credentials to be issued and used in identity-based workflows.
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